Yes, they wouldn't have left Ink for an extended period of time on purpose.
But I could imagine the one driver gets out of the car to smoke a cigarette (or is this forbidden in LA?) or go to the water-closet, while the other dude enters the building to do some paperwork, which usually takes only a few minutes. So here we have no extended period of time.
Then news reports are all over the place - in TeeVo as well as radio broadcasting that riots are all over the place. This draws attention - even from guys who normally tightly stick to their schedule. This might have extended the leaving of the van for another few minutes.
Then you have like screams and turmoil near the Court. The two van-drivers are simply caught in the panick-frenzy that sweeps over the whole area. Maybe they also saw a regular attacking someone and they tried to interfere with the action or something ... So in the end they simply "forgot" about Ink.
Best wishes!
Liam
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